What are good algorithms for vehicle license plate detection? [closed]

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There are a number of approaches you can take but the first strategy that pops into mind is to:

  • Discovery/research: Identify the set of colors and fonts that you may need to identify. If your sample picture is representative of most British plates then your job is made easier. E.g. Simple, singular font and black lettering on a white background
  • Code: Attempt to identify a rectangular region of an image where the colors are predominantly white and black. This is not a terribly math-heavy problem and it should give you the license plate region to concentrate on.
  • Code: Do some clean up on your subregion such conversion to pure black and white (monochrome) and perhaps scaling/shifting into a nice, tight rectangle.
  • Use API: Next employ an existing OCR (optical character recognition) algorithm on your sub-selected image region so see if you can read the text.

Like I said, this is one strategy of many but it comes to mind as one requiring the least amount of heavy math… that is if you can find an OCR implementation that will work for you.

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